NED Abstract

Copyright by European Southern Observatory (ESO).
Reproduced by permission
2010A&A...514A..14K
Large-scale distributions of mid- and far-infrared emission from the center
to the halo of M 82 revealed with AKARI
Kaneda, H.; Ishihara, D.; Suzuki, T.; Ikeda, N.; Onaka, T.; Yamagishi, M.;
Ohyama, Y.; Wada, T.; Yasuda, A.
Abstract. Context. The edge-on starburst galaxy M 82 exhibits complicated
distributions of gaseous materials in its halo, which include ionized
superwinds driven by nuclear starbursts, neutral materials entrained by
the superwinds, and large-scale neutral streamers probably caused by a
past tidal interaction with M 81. Aims: We investigate detailed
distributions of dust grains and polycyclic aromatic hydrocarbons (PAHs)
around M 82 to understand their interplay with the gaseous components.
Methods: We performed mid- (MIR) and far-infrared (FIR) observations of M
82 with the infrared camera (IRC) and far-infrared surveyor (FIS) onboard
AKARI. Results: We obtained new MIR and FIR images of M 82, which reveal
both faint extended emission in the halo and very bright emission in the
center with signal dynamic ranges as broad as five orders of magnitude for
the MIR and three for FIR, respectively. We detected MIR and FIR emission
in the regions far away from the disk of the galaxy, reflecting the dust
and PAHs in the halo of M 82. Conclusions: We find that the dust and PAHs
are contained in both ionized and neutral gas components, implying that
they have been expelled into the halo of M 82 by both starbursts and
galaxy interaction. In particular, we obtain a tight correlation between
the PAH and H{alpha} emission, which provides evidence that the PAHs are
well mixed in the ionized superwind gas and flowing out from the disk.
Key words: galaxies: halos, galaxies: individual: M 82, galaxies:
starburst, ISM: jets and outflows, infrared: galaxies